In the maze-like dungeons of Castle Grotteskew, the fightfully insane Professor Erasmus conducts bizarre experiments and creates a menagerie of freakish monsters. But his very first creation has long been forgotten - a small, almost-human creature, known only as Stitch Head.

When a travelling circus ringmaster, Fulbert Freakfinder, promises to make him a star, Stitch Head wonders whether this could be his chance of freedom. But first he has to catch the professor's latest creation - a monstrous three-armed creature that's causing mayhem in the castle...